These letters usually designate a ball-bearing supported crankshaft This makes the engine run smoother and last longer
Used when high shaft load (radial or axial thrust load) capacity is required Ball bearings are usually used in industrial and agricultural motors Occasionally, roller bearings may be used on larger horsepower motors for maximum radial load capacity
bearings are grease lubricated Most are sealed and do not need any lubrication service Some, however, come with grease cups and can be lubricated with a grease gun Motors that use ball bearings when new are supplied with enough grease in the bearings to lubricate them for a number of months A small amount of grease should be added every tow-three months Use a high grade grease on fully enclosed motors Too much grease may cause the bearings to overheat